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Full text of "How to paint concrete and masonry surfaces."

C/r./ 




How to paint concrete and 
masonry surfaces 




MEDUSA PORTLAND CEMENT PAINT 



HOW TO PAINT CONCRETE 
AND MASONRY SURFACES 



*<f 



HIS book has been prepared to 
show how masonry and concrete 
surfaces, whether exterior or 
interior, damp or drv, can be suc- 
cessfully painted in white or col- 
ors, giving a hard cement-like finish that is perma- 
nent, decorative, damp-proof, washable and Free 
from the deteriorating chemical action of lime and 
alkalies and moisture. The paint that gives these 
advantages is 

MEDUSA PORTLAND CEMENT PAINT 

One of the 8 M«hua Products manufactured hv 
MEDUSA PORTLAND CEMENT COMPANY 
1002 Engineers Bldg. Cleveland, Ohio 

Manufacturers of Medusa Gray Portland Cement 
j> (Plain and Waterproofed i Medusa Waterprc 
if (Powder or Paste): Medusa White Portland Cem.-n- " 
(Plain and Waterproofed): Medus.i Pori 
inent Pamt and ( c n *' Masonrj ' 



■ 



WHY 

Masonry and Concrete Construction 
Needs the Protection of Paint 



H 



Exposure 

Rain, wind, frost and extremes in temper- 
ature are natural enemies of concrete and masonry 
surfaces. No matter how carefully a wall is built, 
unless the mortar joints and the brick, tile or 
concrete surfaces are protected by a permanent, 
damp-proof covering, water — the greatest enemy 
to all construction — is sure to creep into any tiny 
crack or be absorbed into the surface th rough 
capillary attraction. This water freezes and it does 
not take long before the tiny crack widens to such 
an extent as to disfigure the wall and cause per- 
manent damage. 

'Deterioration 

The illustration at the right shows what hap- 
pens when water enters cracks in the mortar joints 





A deteriorated mortar 
foint in masonry wall 



of a wall and freezes. When an) confined 
freezes, it exerts a terrific pressure. In the case of 
cracks in masonry this force breaks off the sides 
of the cracks. The first sign of such deterioration 
is the time to adopt preventative measures, or 
before long the entire wall is weakened. Water 
also when absorbed into a surface dissolves 
soluble matter which is left as stain when the 
water evaporates. 



dampness 



A damp unsightly basement 



It is very common for moisture to c ree p in 
through porous walls and especially through mor- 
tar joints, making inside walls damp. This is par- 
ticularlv true oi walls below grade, as in base- 
ments. Such a condition nor onlv creates an un- 
inhabitable part o'i the building, but frequently 
ruins anything subject to dampne^ tored 

in the inside room. When such dampness occurs. 
efflorescence or deposits of white dusty alkalies 
are generally found on the inside wall. 



For Concrete and ^Masonry ^Interior or Sxterior 



Page Three 



WHY Medusa 

is more suitable for concrete 



How to oAvoid deterioration 

The conditions described on the preceding 
page demand a wall covering that will perma- 
nently protect not only concrete or the brick or 
tile, but also the joints in the masonry wall, from 
the entrance of moisture in tiny cracks and crev- 
ices that are sure to be present sooner or later in 
all walls. The elimination of moisture by a perma- 
nent protective covering solves the problem of 
wall deterioration and at the same time eliminates 
dampness on interior surfaces. 

dampness and Efflorescence 

A paint, to he suitable for painting exterior 

•nr\ and concrete walls, must be capable of 

application to damp surfaces since so many walls, 

especialh those undergrade, are already damp 

and do not drv out thoroughly. Almost even 

damp wall has a white efflorescence, which in turn 

mica! action on paints, causing them to 

off in Makes, or in IODIC 

dust off. Once this peeling or dusting starts, the 

n to the wall is gone. Medusa Portland 

nt Paint prevents the absorption of moisture 

which is the creative tactor of efflor- Fur- 

thermore, it is permanent and in being perma- 
nent, the finish is washable. 

What to Use 

Medusa Portland Cement Paint answers the 

requirements for a successful .: for 

nry and concrete surfaces. This paint has a 

ind cement base. When applied to a wall, it 

forms a permanent bond — that is. it enters the 

surface penetrating the tiniest pore and ke 

the finish to the wall, making a hard cement sur- 

-manent part of the wall. 



^Application 



In application Medusa Portland Cement 
Paint is mixed with water. This is why it can be 
used on a wet or a dry surface. It has in it cer- 
tain damp-proofing qualities that in exterior walls 
prevent moisture from entering at any point 
where it has been applied. On interior walls such 
as in basements it forms a damp-proof coat, keep- 
ing the wall perfectly dry. Whether used inside 
or out, it forms protection against the most de- 
structive element to a masonry or concrete sur- 
face — namely water. With water permanently 
excluded, deterioration is automatically stopped 
and there is no possibility of walls becoming 
stained from dissolving of soluble matter which 
is deposited when the water evaporates. 

When properly applied. Medusa Portland 
ment Paint is unaffected by the chemical ac- 
tion of lime or alkalies. This means that the 
paint will not | lip or J ust ff 

Surfaces 

In applying Medusa Paint it must be re- 
membered that it is designed exclusively for con- 
brick, tile or stone surfa 
It Will not adhere to wood, metal or vitreous sur 
It cannot be used on gla/ed surface tile. 



Healthful Sffect 



Medusa Paint lends 

ame treatment that n \<{ er 

or home own- J rruu , , rat> lr 

to use these colors in combination in a A 
scheme. It comes in white and six hJ U e. 

green, cream, stone gray, pearl gray and 
The colors used are lime and alkali 



wry^Imt 



Portland Cement Paint 

and masonry surfaces 




Cost 

Medusa Portland Cement Paint is decidedly 
the most economical and satisfactory masonry or 
concrete wall covering. The first cost of this 
paint is decidedly lower than other types of wall 
coverings. It has a covering capacity that is much 
greater. In application it is mixed with water and 
can be applied with a Dutch brush or sprayer, 
hand or power operated. And finally, its economy 
is especially pronounced in its permanence. 

ZMany Uses 

Specifications for ordinary paints do not per- 
mit, under any circumstances, the application of 
the paint unless the concrete or masonry surface 
is perfectly dry and if the surface is dry, it must 
be treated with expensive neutralizing agents to 
counteract the chemical reaction of the lime and 
alkalies. 

It is extremely difficult to determine just 
when a concrete or masonry surface is dry or if it 



is dry, how long it will remain so — therefore it is 
of particular importance that a paint be used on 
concrete and masonry surfaces which is of such a 
nature that it would be unaffected by the presence 
of moisture or the chemical reactions en- 
countered. 

Medusa Portland Cement Paint has a Port- 
land Cement base and being manufactured of the 
same basic materials, it makes a natural and per- 
manent bonding without the use of expensive 
neutralizing operations and makes it possible to 
give exposed concrete and masonry surfaces a 
damp-proof as well as a permanent, decorative 
coating at very little cost. 

Medusa Cement Paint can be applied to wet 
surfaces. In fact it is always an advantage if the 
surface is not already damp that it be dampened 
before application of the paint. This uniforms 
the suction and prevents rapid drying out of the 
paint, giving a hard, cement-like finish that is very 
desirable. Because of the consistency recom- 
mended, it flows freely and quickly into the 
cracks and crevices of rough masonry, sealing 
them. 

There are an untold number of uses for 
Medusa Portland Cement Paint. A conception of 
the uses can only be gained by thinking in terms 
of the thousands of uses of brick, stone, tile, and 
concrete, for this paint has an application wher- 
ever these materials are used. 

On the following pages there appear gen- 
eral classifications of uses and a few specific ap- 
plications under each class. If the use in which 
you are interested does not appear under anv 
classification, write and tell us about your require- 
ments. Our technical department will be glad to 
advise you and work with you in the solution of 
vour particular problem. 



For Concrete and SMasonry^ Interior or €xterior 



Page Five 



MEDUSA PAINT has many uses 






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SB ami 
iiuiiiiiiiii 
mini 



1 1 





A Monolith Concrete Building 
m Process of being Painted. 



Where to oApply 



Construction as well as maintenance engi- 
neers of manufacturing plants and public build- 
ings have found in Medusa Portland Cement 
Paint tremendous possibilities for producing satis- 
factory, economical and permanent wall protec- 
tion both inside or outside. 

This cement paint has been successfully ap- 
plied to hundreds of concrete and masonry ex- 
teriors. In such use it has not only beautified the 
buildings but has stopped mortar joints from 
crumbling, thereby saving the cost of pointing up 
a wall, in addition providing protection against 
dampness. 

Many engineers have used this paint for 
walls where ordinary coverings could not be used 
because the walls were damp. It has been par- 
ticularly successful in warehouse use where thou- 
sands of dollars worth of merchandise must be 
kept dry. Electrical power equipment rooms 
where dry walls and ceilings are absolutely essen- 
tial can be rendered damp-proof at a minimum of 
expense. 



Where Light is Essential 

The white Medusa painted wall has been 
used time and again for lighting up and damp- 
proofing underground tunnels, passage ways, 
boiler rooms, etc. This paint is also widely used 
in factories where light is essential. 

Cost 

Industrial maintenance painting of today 
seeks the greatest possible protection and perma- 
nency at the lowest possible cost. In these re- 
spects Medusa Portland Cement Paint has proved 
its worth. Because this paint can be used on wet 
or dry concrete or masonry surfaces, makes a 
permanent bond, is washable and decorative and 
because its first cost and application are very 
economical, many industrial concerns have stand- 
ardized on Medusa Paint for all concrete and 
masonry surfaces as a maintenance paint and for 
new construction. On new industrial work it can 
be used before the walls dry out, thereby saving 
expensive delays and speeding up the finishing 
work. 



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A Real Landn 



Page Six 



For Concrete and Masonry ^Interior or Gxterior 



in the INDUSTRIAL FIELD 






L 1 i[is 



Storage Ifpoms 




Factory Extenor 




Smokestacks 




Storage Basements 

For Concrete and iMasonry^ Interior or Exterior 



"Water- Waste" costs many thousands of 
dollars per year. By "Water- Waste" we mean the 
condition caused through leaky warehouse walls, 
whether below or above grade, which are con- 
tinually damp and cause a damp condition inside 
of the warehouse. This causes rust on the metal 
parts stored and seriously affects other merchan- 
dise. 

The low cost of damp-proofing the interior 
and exterior of your storage basement or ware- 
house with Medusa Portland Cement Paint will 
be only a fraction of the cost of merchandise lost 
through "Water- Waste." In addition to insurance 
against deterioration from moisture, Medusa Ce- 
ment Paint beautifies and enhances visibility. 

^Miscellaneous 

In addition to the painting of concrete and 
unglazed masonry interior and exterior walls in 
the industrial field, Medusa Portland Cement 
Paint also has a wide range of miscellaneous uses. 
For example, it has been preeminently successful 
in the painting of smokestacks, water towers, stor- 
age bins and elevators, service stations and public 
garages. 

Industrial and maintenance engineers who 
have concrete or masonry painting problems fac- 
ing them are invited to put those problems up to 
our technical department. 

Plant engineers of recognized firms who de- 
sire to try out Medusa Portland Cement Paint 
before starting an extensive painting project can 
secure a generous working sample by sending in 
a request on their company's stationery. 

When you get this sample make a test on 
any convenient concrete or unglazed masonrv 
wall. Before using read the directions as given 
on the can and follow them closely in applying 
the paint. 



Page Seven 



Thousands of pounds used for RAILROAD WORK 

train sheds, freight stations, warehouses, etc. 




^Maintenance 

Railroad maintenance engineers find that 
Medusa Portland Cement Paint prevents disin- 
tegration, beautifies and gives greater visibility to 
concrete train sheds, freight stations, warehouses, 
bridges, abutments, whistle posts, retaining walls, 



etc. This paint is unaffected by exposure to the 
elements. It resists the chemical action of lime 
and alkalies, will not peel, scale or dust off, but 
remains as permanent protection against deteri- 
oration and water absorption. 



"Da vip-p roofing 



It is particularly advantageous in the paint- 
ing of both inside and outside of warehouses 
where freight is stored, since its damp-proofing 
qualities make a dry warehouse. 

Send for "Test Sample 

A generous testing sample will be sent to 
railway engineering departments. 

We will appreciate an invitation to advise 
you regarding this material for any specific job 
you may have in mind. 




Applying Medusa Portland C- ■ ■ * Tram Sheds. Cleveland V- 

For Concrete and (Masonry^Interior or exterior 



Pste 



Unsurpassed for painting SWIMMING POOLS 




AN OUTDOOR POOL 

Sanitation is an important factor in Swimming Pools- 

a coating of Medusa Paint is easily cleaned. 




AN INSIDE POOL 

Use Medusa Portland Cement Paint for visibility and 

to promote sanitation. 




Medusa Portland Cement Paint is unsur- 
passed for painting outside and inside swimming 
pools. It is economical and efficient. It gives a 
hard cement-like finish that is unaffected by lime 
and alkali chemical reaction encountered in the 
concrete or water. The finish does not require 
frequent renewal and is inexpensive in cost of 
material and cost of application. 

^w Wools 

The best time to paint a pool is immediately- 
after completion, while the concrete is still damp. 
In this use, directions given on another page 
should be followed closely. 

Used "Pooh 

Unpainted old pools may have water solu- 
bles adhering to the walls or floors. These sur- 
faces should be washed down with a 10'^ solu- 
tion of muriatic acid, which removes body oils 
and efflorescence, if present. 

Previously tainted Wools 

The old paint of previously painted pools 
must be removed either by scraping, muriatic acid 
wash, or burning off with a torch, or the surface 
treated with a solution of 
1 lb. of raw caustic soda 
to 1 gallon of hot water. 
Ic is then ready to paint. 

Medusa Paint is also 
widely used for showers, 
walks, light standards and 
other concrete and ma- 
sonry construction adja- 
cent to pools. Let us send 
vou a list of representa- 
tive pools that have been 
painted with Medusa 
Portland Cement Paint. 



For Concrete and SMasonry^ Interior or Exterior 



Page Nine 



The use of MEDUSA PORTLAND 



Medusa Portland Cement Paint can be used 
to an advantage in every home built, regardless 
of whether it is brick, stone, masonry or wood 
construction. It can be used to an advantage on 
both new and old construction. 

The 'Basement 

The most wide-spread home use of Medusa 
Paint is for painting basements. There is no 
reason why this important part of a home should 
be omitted when it comes to painting. Most paint- 
ing contracts include outside walls and trim, in- 
side trim, floors and possibly the entry way of 
the basement — but the basement is usually left 
unpainted. 

The modern trend for livable basements is 
bringing a change in this old-fashioned idea of 
leaving the basement unpainted. The advent 
of oil and gas burners as well as other types of 
heating equipment makes for greater cleanliness 
in the heating of the home. The manufacturers 
of these heating systems are promoting the use 
of the basement for something else than a place 
to store fuel and rubbish. Architects and builders 
have taken up the idea of utilizing waste base- 
ment space by turning it into recreation rooms, 
dens, music rooms, etc. In order that these rooms 
may be practical, they must be clean, dry and well 
painted. In this connection Medusa Portland 



Cement Paint has become essential as the best 
means of decorating the basement, not only rec- 
reation rooms, etc., but laundry and boiler rooms 
— in fact, the entire basement. 

Medusa Portland Cement Paint transforms 
the dark, dirty, damp basement into a dry, clean, 
bright livable part of the house. The hard 
cement-like finish that this paint gives on con- 
crete and unglazed masonry surfaces is a perma- 
nent bond that is damp-proof and decorative. 
Medusa Portland Cement Paint enables the base- 
ment to be finished in white, blue, green, cream, 
stone gray, pearl gray or red. This wide variety of 
colors enables any home owner or architect to se- 
cure any decorative effect that he desires. Quite 
frequently the basement is painted in white or 
pearl gray or cream to give the greatest possible 
amount of light, and a darker color is used on the 
first 6 or 8 inches of the wall above the floor, 
making a baseboard effect. This keeps the lighter 
wall from getting splashed or dirty when the floor 
is washed or scrubbed. 

Jinish can be Washed 

One of the distinct advantages in the use of 
Medusa Paint m the basement is its permanence 
and the fact that dirt can easily be washed from 
the surface. This keeps your walls bright and 
clean and eliminates frequent renewal. 





Applying 



Page Tea 



For Concrete and M a* mrj ^Interior or Exterior 



CEMENT PAINT for homes 







A Common Brick Home Painted 
with Medusa Cement Paint. 



Damp-proofs 



Many basements have walls that are damp. 
Recreation rooms that are damp are unpleasant 
and unusable. The use of Medusa Paint will give 
a damp-proof coating to the wall and make the 
room perfectly dry. 

Ordinary paints in a basement soon give way 
to the chemical action of lime and alkalies in the 
wall, causing the paint to scale, peel, chip or dust 
off. Medusa Portland Cement Paint, properly 
applied, is unaffected by this chemical action, 
hence a permanent finish is secured. 

Jor fainting ^rick Homes 

The home owner who wants a painted brick 
home will find in Medusa Paint a permanent 
beauty that will make the home stand out as hav- 
ing a distinctive charm of its own. In addition to 
beautifying the home, the paint will protect the 
walls from disintegration due to water entering 
mortar joints, freezing and crumbling the mortar 
away. Medusa Portland Cement Paint is ideal for 
painting airways around basement windows, to 
give greater light to the basement. It is also fre- 
quently used for painting outside of foundations 
above grade whether they are of concrete, brick 
or tile. In these cases the home owner will find 
the paint standing up for an infinitely greater 
length of time than ordinary paints. 



To give weather-beaten effects to a home, 
we would suggest that the common brick surface 
be first given two good coats of Medusa Portland 
Cement Paint. This will act as a permanent coat- 
ing to prevent the absorption of moisture and 
protect the surface. The Medusa Portland Ce- 
ment Painted surface can then be covered with 
as many coats of white-wash as desired. The white- 
wash will have a tendency to crack, blister and 
peel, giving a weather-beaten effect which has be- 
come very popular. 

Unless the brick surface has been given two 
coats of Medusa Cement Paint, there is a possi- 
bility of dampness entering the brick wall, either 
through the brick or mortar joints and causing a 
damp, unsatisfactory condition. 

^Miscellaneous Uses 

In addition to the above uses of Medusa 
Portland Cement Paint around the home, there 
are many other minor uses. For example, be- 
cause of its permanence it is ideal for painting 
chimneys. There is nothing better for renewing 
tin- appearance of garden furniture, trim stone, 
stucco panels and stucco houses. The use of 
Medusa Portland Cement Paint around the home 
is only limited by the amount of masonry or con- 
crete construction. It can be applied on exteriors 
or interiors with equally good results. 




For Concrete and SMasonry^ Interior or Sxterior 



Page Eleven 



MEDUSA paint widely used for- 

BRIDGES, CULVERTS, CONDUITS, etc. 



? 



7 










Bridge Railings should be Painted for Vistbility and A 

Taint for 'Visibility 



ppearance 



Highway engineers and public officials rec- 
ognize in Medusa Portland Cement Paint an 
ideal protection and a means of gaining perma- 
nent beauty and assuring visibility for bridges, 
culverts, conduits, light standards and other forms 
of concrete and masonry public work. It forms 



a permanent bond with the wall, keeping out all 
moisture and affording ample protection against 
disintegration and staining. It is much less ex- 
pensive to guard against deterioration through the 
use of Medusa Paint than to repair or rebuild. 
A sample will be sent to public officials. 





P*ge Twelve 



For Concrete and ZMasonry^ Interior or Exterior 



Nothing better for concrete or masonry 

SILOS, BINS and ELEVATORS 




Sanitary Milk House 

Medusa Portland Cement Paint plays a lead- 
ing role in the protection from moisture of grams. 
ensilage and other commodities that are Stored in 
silos, bins, or elevators of concrete or mason r\ 
construction. 

In the above use this paint forms a highly 
protective coating for the wall, eliminating anv 
possible chance for water to enter and freeze 
causing disintegration or for moisture to be ab- 
sorbed through the wall. By keeping such struc- 
tures painted both inside and out with Medusa 
Paint, they will be given a permanence not at- 
tained in any other wav. 

Grain Elevators painted with Medusa Port- 
land Cement Paint stand out as the distinctive 





landmarks in their community. I'he surface is 

protr linsi the destructive action ot the 

elemi 

The ing value 01 \ Medusa Cement 

Painted Grain Elevator is much >:r< in the 

cost of the paint, m addition to eliminating 
pensh e m lintenan 

lent Paini flm^^ Freel) from the 
brush and permits the paintei to co 

rough masonr) wiri no hll all the 



On the Jarm 



Gram Elevators 



( Concrete plays an important part in 

-ruction today. This concrete farm construe 

tion should be protected with M Paint. 

Barns of all kinds, silos, watering troughs, poultrv 
houses, milk houses, and machinery buildings 

(and concrete ten it constructed of con- 

crete or masonry, should be protected bv Me 
Paint both inside and out. 

The farm hi \igeousi\ 

-ins paint in the basement, foundation ex- 
tenor, chimnev. or if a concrete block, brick or 
stucco house, the entire exterior as described in 
section on home uses on another page in this 



For Concrete an, *rf+ Interior or dxtertor 



Page T 



Miscellaneous Uses for 

MEDUSA PORTLAND CEMENT PAINT 




There is no end to the hundreds of uses for 
Medusa Portland Cement Paint. In addition to 
its many uses in the industrial field, in the home, 
railroad work, etc., any concrete or unglazed ma- 
sonry, regardless of where or how used, should 
be protected, damp-proofed and made more at- 
tractive with this paint. 

For example, filling stations that want to 
keep their places looking clean and bright use 
Medusa Paint for concrete curbs, pump bases, 
light standards and foundations. Manufacturers 
of concrete burial vaults use Medusa Portland 
Cement Paint both inside and outside of their 
vaults. 

Many cities and towns having concrete street 
lighting standards use Medusa Paint to keep 
them bright and attractive and to protect them 
against deterioration. 

Concrete Products 

In the concrete products field, manufacturers 
of concrete blocks, concrete brick, tile and other 
products are using cement paint to give both pro- 
tection and color to their products. It is advisable 
to apply Medusa Cement Paint after the unit has 
been laid up as it will give protection to the joints 
as well as the block and be much more attracts 

Smokestacks, tunnels, garden furniture, bird 
baths, clothes posts, fence posts, water tanks and 
trim stone are other uses for Medusa Portland 
Cement Paint. 

Where to get 

{Medusa Portland Cement Taint 

Medusa Portland Cement Paint ran be pur- 
chased from building supply dealers, paint st« 
hardware stores, and mill supply houses. If ,t is 
not available in your community, please write us 
direct and we will see that your dealer gets it for 



Fo) 



Page Fourteen 



Concrete and 31a><>nr^ Interior or Exterior 



Directions for using ~ 

MEDUSA PORTLAND CEMENT PAINT 



Preparation of Surface 

Clean off all dirt and dust and any whitish 
efflorescence that may be present. The Paint will 
not stay where efflorescence has not been re- 
moved. 

The surface should then be wet down with 
water — this prevents the porous wall from sucking 
the water out of the paint before it has had a 
chance to harden — and gives an easy flow to the 
paint, eliminating the drag of a dry surface. On 
exposed surfaces, especially in dry, hot weather, 
special care should be used in thoroughly wetting 
the surface. This can be done with a hose at little 
cost or effort. 

Covering Capacity 

Dependent upon the surface to be painted, 
ten pounds of paint will cover from 200 to 350 
square feet of surface, one coat. 

Mixing 

First Coat — Use five quarts of water with 10 
pounds of paint — add the paint slowly while stir- 
ring the water. This will prevent the forming of 
lumps. 

Second Coat — Same as above, except that 
four quarts of water should be used with 10 
pounds of paint. Be sure and wet the first coat 
before applying the second. 

A thinner paint is recommended for the first 
coat so that it can work its way into the cracks and 
surface pores and seal them, preparing a good 
base for the second coat. 

The second coat can be applied the day fol- 
lowing the application of the first coat. 

Where only one coat is to be applied, 3 l /i 
to 4 quarts of water should be used to 10 pounds 
of paint. Where a particularly heavy coat of 
paint is desired, simply reduce the amount of 
water recommended. 

Each coat should be wet down as soon as it 
has hardened sufficiently so as not to damage the 
paint. 

How to Apply 

Apply with Dutch brush or spray, hand or 
power operated. When spray is used, mechanical 
agitation is necessary. When a brush is used, 
employ a horizontal sweeping motion, keeping 



the brush full of paint. Stir the paint with the 
brush each time it is dipped — this prevents set- 
tling of the paint. 

Because Medusa Cement Paint is very 
easy to apply and flows freely from the brush, 
eliminating the drag, the use of a spray is neces- 
sary only on large operations. We will gladly sup- 
ply specifications for applying with a spray. 

Cracks 

Make a paste with the paint, tinting it to 
match the color of the surface to be painted and 
fill the crack. If this is done, the cracks will be 
hardly visible. Where only small cracks are en- 
countered, work the paint in with the brush. 

Packages 

Medusa Portland Cement Paint is manufac- 
tured in white and six colors and is furnished in 
10 pound pails; 50 pound steel cans and 3 50 
'pound steel drums — all having large friction 
covers. 

Cautions 

Prior to applying Medusa Portland Cement 
Paint to walls and floors of old concrete swim- 
ming pools, the concrete surfaces must be washed 
with a strong solution of muriatic acid and water 
(1:10 or 1:15) to remove the film of body oils 
and grease absorbed by the concrete. After acid 
ceases foaming, the surfaces must be thorough lv 
washed with clear water to remove all of the acid 
solution. 

If the surface has been previously white- 
washed or kalsomined, or covered with cold-water 
paint, it will be necessary to remove the old finish 
before applying the Medusa Portland Cement 
Paint. 

Medusa Portland Cement Paint will not bond 
permanently to a non-absorbent surface such as 
enameled brick, vitrified or glazed brick, or hard- 
burned, non-porous tile, or magnesite stucco. 

Do not apply Medusa Portland Cement 
Paint during freezing weather. 

Do not apply Medusa Portland Cement 
Paint over previously painted masonry without 
getting special directions. 

Do not apply Medusa Portland Cement 
Paint to concrete floors, except floors of swimming 
or wading pools. 



For Concrete and ^Masonry ^Interior or Exterior 



Page Fifteen 



A questionnaire on 

MEDUSA PORTLAND CEMENT PAINT 

Q. What is Medusa Portland Cement Paint? 

ANS:— A dry powder mixed with water. It has a Portland Cement base. 

Q. Where can it be applied? 

ANS.— All concrete and masonry surfaces, interior or exterior — except vitrified or glazed 
surfaces, floors and magnesite stucco. 

Q. What treatment of the surface is necessary before applying Medusa Portland Cement Paint? 

ANS:— None, provided the surface has never been painted. In case of previously painted 
surfaces, the old paint should be removed. We are prepared to furnish specifica- 
tions for this operation. 

Q. How is Medusa Portland Cement Paint applied? 

ANS:— With a Dutch or whitewash brush, or it can be sprayed on. Exposed or highly por- 
ous surfaces should be wet down with water to uniform the suction before painting. 

Q. Why is Medusa Portland Cement Paint different from oil paints? 

ANS:— The chemical reaction of lime and alkalies destroys oil paints quickly, especially if 
they come in contact with moisture. Having the same base as the surface to which 
it is applied. Medusa Portland Cement Paint makes a natural bonding, becoming a 
part of the wall, and is unaffected by these natural conditions. 

Q. Does moisture in the surface affect Medusa Portland Cement Paint? 
ANS:— NO. It is really an advantage. 

Q. Why should it be used on exterior masonry surfaces? 

ANS:— To prevent the penetration of moisture and retard the disintegrating effect o^ the 
freezing and thawing of the moisture, eliminating costlv maintenance. 
Q. Why should it be used on interior walls? 

ANS:— For decoration, lighting and moisture resisting. It gives a washable surface. 
Q. How does Medusa Portland Cement Paint compare with other paints in cost? 

ANS:— Considerably- less than even the cheapest oil paints. 
Q. What is the most outstanding feature of Medusa Portland Cement Paint? 

ANS:— It can be applied to wet or fresh concrete and masonry surfaces without the expenv 
application of neutralizing agents. The large coverage and ease of application I 
it very inexpensive, and it does not require frequent renewals. 

MEDUSA PORTLAND CEMENT COMPANY 



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Page SiMteen 



1002 Engineers Building, Cleveland, Ohio 

Manufacturers of Medusa Grav Portland Cement (Plain ; 
Waterproofed); Medusa Waterproofing (Powder or Paste); Medusa 
White Portland Cement (Plain and Waterproofed); Medusa 
Portland Cement Paint and Medusa-Mix. The Masonry Cement. 

For Concrete and -SMasotiry ** Interior or £xU rior 



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